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CMake: Fix prl files of static Qt builds

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Static Qt plugins should not be included in the list of libraries of
a prl file. They end up being there due to our circular dependency
trick where the plugins depend on the module they belong
to.

This in turn causes the giant static plugin generator expressions to
be processed in qt_collect_libs(), and the generated prl file ends up
having target names like Qt6::QJpegPlugin which are obviously not
linker flags.

To eliminate the static plugins from prl files, add an additional
dummy boolean generator expression '$<BOOL:QT_IS_PLUGIN_GENEX>'
that always evaluates to true. We can string match on this expression
in qt_collect_libs, and thus remove the whole static plugin genex
entry.

This should fix linking of apps with qmake that use a CMake-built
static Qt.

Task-number: QTBUG-85865
Task-number: QTBUG-85240
Task-number: QTBUG-85801
Change-Id: I949dc5edb10d94c4ab84ed430af7c164d8efaaa6
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
This commit is contained in:
Alexandru Croitor 2020-08-05 14:56:51 +02:00
parent 9a900dfb07
commit d50a7d635c
2 changed files with 10 additions and 0 deletions
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6
cmake/QtBuild.cmake
View File

@ -3247,6 +3247,12 @@ function(qt_internal_walk_libs target out_var dict_name operation)
lib "${lib}")
endwhile()
# Skip static plugins.
set(_is_plugin_marker_genex "\\$<BOOL:QT_IS_PLUGIN_GENEX>")
if(lib MATCHES "${_is_plugin_marker_genex}")
continue()
endif()
if(lib MATCHES "^\\$<TARGET_OBJECTS:")
# Skip object files.
continue()

4
cmake/QtPlugins.cmake.in
View File

@ -19,6 +19,9 @@ if(NOT @BUILD_SHARED_LIBS@)
set(_manual_plugins_genex "$<GENEX_EVAL:$<TARGET_PROPERTY:QT_PLUGINS>>")
set(_no_plugins_genex "$<GENEX_EVAL:$<TARGET_PROPERTY:QT_NO_PLUGINS>>")
# Plugin genex marker for prl processing.
set(_is_plugin_marker_genex "$<BOOL:QT_IS_PLUGIN_GENEX>")
# In super builds the rules below pollute the dependency rule for the
# plugin target when it's being build, causing cyclic dependencies.
# to overcome this, we check if the current target where this rule evaluates
@ -94,6 +97,7 @@ if(NOT @BUILD_SHARED_LIBS@)
# Complete condition that defines whether a static plugin is linked
string(CONCAT _plugin_condition
"$<BOOL:$<AND:"
"${_is_plugin_marker_genex},"
"${_build_allow_plugin_link_rules_genex},"
"$<OR:"
"${_plugin_is_whitelisted},"